Amazon took to social media...with a cagey promotion for an upcoming launch. ... A 50-second YouTube video showing people's reactions to some kind of device. [But it] never shows the actual device.

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Amazon has been rumored to be working on a smartphone with retina-tracking technology to make some objects appear in 3D. ... The video suggest that the device could have 3-D technology. "It moved with me," one person said. MORE

And Steve Kovach looks inside:

The video shows a bunch of people moving their heads around and getting super excited.

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[It's] said to have several front-facing cameras that can track your head's movement and display images [so] they appear to pop out in 3D. MORE

But Jacob Siegal has heard it all before:

We’ve played our part in spoiling the surprise, but it looks like Amazon is finally ready to unveil it.

When you click...for an invite request and mark that you’re a developer, the form asks you for an example of an “innovative way in which you have used gyroscopes, accelerometers, compass, or other sensors in your app development” and asks whether you’d be interested in “developing apps that utilize a novel type of sensor.” MORE

Waddya mean, the video doesn't show the device? The eagle-eyed Jared C. and Leonard Ovi beg to differ: